A 38-year-old woman with generalized anxiety disorder reports being consumed by the thought 'I am a terrible mother.' Despite evidence to the contrary, she states the thought feels absolutely true and dominates her daily functioning. Her PMHNP, trained in Acceptance and Commitment Therapy (ACT), asks her to repeat the phrase 'I am a terrible mother' rapidly for 30 seconds until the words begin to lose their meaning, and then to restate it as 'I am having the thought that I am a terrible mother.' Which of the following best describes the therapeutic mechanism being applied?